You only want to use DYNAMIC usage if the resource will actually be dynamic. In other words, that usage is designed for cases where the CPU will need to update the contents of the resource many times during the lifetime of that resource. If you just want a static read-only texture, then you should use IMMUTABLE usage and initialize the contents of the texture using the pInitialData parameter. For the case of a texture array, you'll want to pass a pointer to an array of N D3D10_SUBRESOURCE_DATA, where N is the number of array slices in your texture. Then for each D3D10_SUBRESOURCE_DATA, you need to set pSysMem to a pointer to the texture data for a single array slice.